Piston puller



June 1942- D. A. KELLY 2,285,983.

. PISTON FULLER Filed Sept. 22, 1941 INVENTOR DANIEL ALLCOTT KELLY ATTORNEYS Patented June 9, 1942 PISTON FULLER Daniel Allcott Kelly, Milwaukee, Wis., 'assignor to The Prime -Ma-nufacturing Company, Milwaukee, Wis.

Application September 22, 1941, Serial No. 411,863

2 Claims.

This invention appertains to a jack for forcing one part away from another part, and more particularly to a novel device for loosening piston rods in cross heads.

One of the primary objects of my invention is to provide a compact and durable jack which can be conveniently placed in a cross head between the wrist pin and piston rod, whereby to loosen the rod in the cross head to facilitate the removal thereof.

It has heretofore been proposed to utilize hydraulic jacks for parting piston rods from cross heads, and in all of these devices with which I am familiar, it is necessary to employ a pump with its operating device for forcing the oil to the jack, a reservoir and other associate parts. This type of appliance is expensive, awkward to use and cumbersome to manipulate. It is also necessary to employ a wheeled carriage for supporting the various parts of the apparatus and this carriage must be placed adjacent to the locomotive.

It is therefore another salient object of my invention to provide a freely portable jack which can be easily and quickly placed in position in a cross head and which can be actuated by a portable hand grease gun so that the employance of wheeled carriages, complicated oil pumps and the like is eliminated.

A further important object of my invention is to provide a jack utilizing hard grease as its pressure transmitting element and which merely includes a body block having cylinder chambers therein arranged in longitudinal alignment for receiving the pistons for operating against a pressure plate with means for delivering the grease to the piston chambers.

A still further object of my invention is the provision of grease conducting pipes connected with the body block and which serve as handles for facilitating the placing of the jack in the cross head with a grease gun fitting connected with said pipes for receiving the grease gun.

A still further important object of my invention is to provide novel means for constructing the body block whereby the same will snugly receive and contact the wrist pin so that the jack will be held steady during the actuation thereof to loosen the rod in the cross head, the wrist pin being adapted to be inserted between the grease P conducting pipes and against the body block after the jack is placed in the cross head.

With this and other objects in view the invention consists in the novel construction, arrangement and formation of parts, as will be hereafter more specifically described, claimed and illustrated in the accompanying drawing, in the drawing- Figure l is a horizontal sectional view through a cross head taken substantially on the line l-l of Figure 2 looking in the direction of the arrows showing my jack in its operative position in said cross head.

Figure 2 is a vertical longitudinal sectional view through the cross head and jack, the view being taken substantially on the line 2-2 of Figure 1 looking in the direction of the arrows.

Figure 3 is a front elevational View of the jack showing same removed from the cross head.

Referring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter J generally indicates my novel jack for separating a piston rod R from the cross head H.

The cross head H is of the ordinary construction employed in locomotives and can be of any of the various well known types. As illustrated the same includes the top slide guide piece 5, depending side walls -or cheeks 6 and the forwardly extending tapered socket 1 for the piston rod R.

A cross key, not shown, can be employed for securing the cross head to the piston rod. The side walls or cheeks 6 are provided with openings 8 for detachably receiving the Wrist pin 9.

Great difficulty is experienced in initially loosening piston rods from their cross heads when it becomes necessary to separate these parts and my novel jack J has been designed to permit the expeditious loosening of the piston rod R from its cross head H.

My jack J includes an elongated body block In having its inner face at its transverse center provided with a guide groove I I, which is adapted to receive the wrist pin 9. On each side of the groove H the body block is provided with cylinder chambers l2 and these cylinder chambers open out through the front face of the block.

Pistons I3 are slidably mounted in the cylinder chambers and the same are provided with suitable piston leathers !4. A longitudinally ex tending pressure plate l5 bears against the outer ends of the pistons and suitable guide pins it connect the pressure plate with the pistons. The pressure plate also carries at its center a wear bearing plate I! for engaging the inner end of the piston rod. A guide pin I8 can be employed for connecting the wear plate with the pressure plate. Formed in the body block In on each side piston chambers l2.

thereof are grease channels l9 and each channel communicates with an adjacent piston chamber [2. Each channel l9 also has communicating therewith an inlet port 29 and securely threaded in the ports are grease conducting pipes: 2 l. The pipes 2| are in turn fastened to a connecting manifold pipe 22 which carries a grease fitting 23. When viewed in side elevation the manifold pipe 22 and the pipes 21 form a substantially U shaped structure for a purpose which will be later set forth.

In connection with my jack I employ a grease gun (not shown), which is detachably connected with the fitting 23 for forcing grease under high pressure into the channels 19 and thence into the piston chambers 82 against the pistons l3.

In use of my jack the wrist pin 9 is removed from the cross head and the jack is grasped by the pipes 2|, which form manipulating handles, and is placed within the cavity in the cross head between the side walls or cheeks thereof and against the piston rod R. To prevent damage to a wrist pin, which is in good condition, a worn Wrist pin can be utilized and this worn wrist pin is inserted in the openings 8 of the cross head in the groove H between the pipes 25 and 22. The jack is manipulated by the pipes 2! until the wear plate I! is properly fitted against the inner endof the piston rod. The grease gun is now attached to the nipple or fitting 23 and the gun is manipulated so that the grease under pressure will flow through the pipes 25,, as heretofore stated into the channels I 9 and into the Thus each one of the pistons !3 will receive equal pressure and the pistons will be forced toward the piston rod forcibly urging the wear plate I! into bearing contact with said piston rod. The force created by the grease under pressure will effectively loosen the rod R in its socket and obviously very little movement of the jack is required to loosen the rod. As soon as the piston rod becomes free of the walls of its socket the rod can then be easily removed from the cross head.

Great stress is laid on the compact structure of the jack and the fact that the jack can be used in connection with an ordinary grease gun.

Various changes in details can be made without departing from the spirit or the scope of this invention, but what I claim as new is:

1. A jack for loosening piston rods in cross heads comprising a solid elongated body block having piston chambers adjacent to the opposite ends thereof opening out through the front face of the block, pistons slidably mounted in said chambers, a pressure plate extending longitudinally of the body block connected with said pistons, a center member carried by the pressure plate for engaging the inner end of a piston rod, said block having channels therein communicating with the inner ends of the piston chambers, pressure conducting pipes communicating with the channels, and the inner face of said block being provided with a transverseh extending centrally disposed wrist pin receiving bearing groove.

2. For use with a cross head having a cavity and a piston rod socket and a removable wrist pin extending through the cavity, a jack for loosening the piston rod from the walls of its socket removably fitted in said cavity, said jack including an elongated body block having piston chambers on opposite sides of its transverse center opening out through the forward face thereof, pistons slidably mounted in said chambers, a pressure plate extending longitudinally of the block fitted against said pistons, a wear plate carried by the pressure plate engaging the inner end of the piston rod, said block having grease conducting channels therein communicating with the inner ends of the piston chambers, pressure connecting pipes rigidly secured to the body block on opposite sides of its transverse center and communicating with said channels, said pipes constituting manipulating handles for-the jack, a cross manifold pipe connecting the first mentioned pipes together, a grease fittting for a grease gun carried by the manifold pipe, and the inner face of said block being provided with a transversely extending groove disposed between said pistons, the wrist pin being adapted to be inserted in said cross head through the cavity between the pipes and in said bearing groove.

DANIEL ALLCOTT KELLY. 

